from flask import Flask
from config import config_dict, REDIS_HOST, REDIS_PORT
from flask_session import Session
from flask_sqlalchemy import SQLAlchemy
import logging
from logging.handlers import RotatingFileHandler
from redis import StrictRedis
from flask_wtf.csrf import CSRFProtect, generate_csrf
from info.utils.commons import index_filter

db = SQLAlchemy()
redis_store = StrictRedis(host=REDIS_HOST, port=REDIS_PORT, decode_responses=True)


def create_app(config_name):
    app = Flask(__name__)

    app.config.from_object(config_dict[config_name])

    # redis connection
    Session(app)
    # mysql connection
    db.init_app(app)
    # start csrfProtect
    CSRFProtect(app)

    @app.after_request
    def after_request(response):
        csrf_token = generate_csrf()
        response.set_cookie('csrf_token', csrf_token)
        return response

    # register blueprint
    from info.modules.news import news_blue
    app.register_blueprint(news_blue)
    from info.modules.passport import passport_blue
    app.register_blueprint(passport_blue)
    from info.modules.profile import profile_blue
    app.register_blueprint(profile_blue)
    from info.modules.admin import admin_blue
    app.register_blueprint(admin_blue)

    # 添加过滤器
    app.add_template_filter(index_filter, 'index_filter')

    # 设置日志的记录等级
    logging.basicConfig(level=logging.DEBUG)  # 调试debug级
    # 创建日志记录器，指明日志保存的路径、每个日志文件的最大大小、保存的日志文件个数上限
    file_log_handler = RotatingFileHandler("logs/log", maxBytes=1024 * 1024 * 100, backupCount=10)
    # 创建日志记录的格式 日志等级 输入日志信息的文件名 行数 日志信息
    formatter = logging.Formatter('%(levelname)s %(filename)s:%(lineno)d %(message)s')
    # 为刚创建的日志记录器设置日志记录格式
    file_log_handler.setFormatter(formatter)
    # 为全局的日志工具对象（flask app使用的）添加日志记录器
    logging.getLogger().addHandler(file_log_handler)

    return app
